From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.tglx.de (www.osadl.org [213.239.205.134]) by ozlabs.org (Postfix) with ESMTP id 3A58ADDF2C for ; Sat, 19 May 2007 02:45:41 +1000 (EST) Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver From: Thomas Gleixner To: Kumar Gala In-Reply-To: <32E780BE-58B7-4303-AA49-1852C4C7EB50@kernel.crashing.org> References: <200705172142.26739.sshtylyov@ru.mvista.com> <8E44DB06-767D-4864-8D2C-6132E4D4370B@kernel.crashing.org> <464C99FF.8080404@ru.mvista.com> <135307ED-7125-4859-8594-4B5B900D92D6@kernel.crashing.org> <464C9E67.2020909@ru.mvista.com> <6E0D5E13-C939-4FCE-81A3-F29DFA6436A2@kernel.crashing.org> <464CA222.8000407@ru.mvista.com> <464D9E7E.3090605@genesi-usa.com> <464DADFC.3080802@ru.mvista.com> <464DB800.40702@genesi-usa.com> <1179499713.12981.75.camel@chaos> <32E780BE-58B7-4303-AA49-1852C4C7EB50@kernel.crashing.org> Content-Type: text/plain Date: Fri, 18 May 2007 18:50:59 +0200 Message-Id: <1179507059.12981.81.camel@chaos> Mime-Version: 1.0 Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, mingo@elte.hu List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Fri, 2007-05-18 at 11:31 -0500, Kumar Gala wrote: > I asked this earlier, but figured you might have a better insight. > Is their value in having 'drivers' for more than one clock source? > I'd say most (of not all) the PPC SoCs have timers on the system side > that we could provide drivers for, I'm just not sure if that does > anything for anyone. Not necessarily for the tick/highres stuff, but clock events allows other users as well to utilize such facilities. We have no users yet, but there are drivers, which utilize special timer hardware with nice #ifdeffery to allow the driver to be shared. This might be a useful thing for such stuff. tglx